Abstract
Film boiling heat transfer coefficients on horizontal cylinders with the diameters of 0.08 and 0.5 mm were measured under saturated conditions for the liquid temperatures of 1.8, 1.9, 2.0 and 2.1 K (He IIs), and under subcooled conditions for the same liquid temperatures at atmospheric pressure (He IIp). At the maximum heat flux, q max , of Kapitza conductance regime in He IIs, the heat transfer state changes from Kapitza conductance regime to film boiling regime with a jump of the heater surface temperature. On the other hand, the heat transfer changes to film boiling with little jump of the heater surface temperature at q max in He IIp. The film boiling heat transfer coefficients under saturated conditions are dependent on the pressure at the level of the test cylinder, surface superheat and bulk liquid temperature.
A model for film boiling heat transfer from a horizontal cylinder in He II based on latent heat transport, non-equilibrium kinetic effects at the vapor-liquid interface and the heat transport in the superfluid is presented. An equation of film boiling heat transfer was obtained based on the numerical solutions of the model and experimental data. The equation can predict the experimental data of film boiling heat transfer coefficient under saturated and subcooled conditions within ±20 % difference. The fact that the surface temperature jump occurs at q max in He IIs, but does not occur at q max in He IIp can be explained by the model.
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Hama, K., Hata, K., Shiotsu, M. (2000). Film Boiling on a Horizontal Cylinder in Saturated and Subcooled Helium II. In: Shu, QS. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4215-5_11
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DOI: https://doi.org/10.1007/978-1-4615-4215-5_11
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